The nineteenth-century policy of was based on the geographic distance of the united states from other countries

It is known as the isolationism. Isolationism is a class of remote arrangements systematized by pioneers who affirmed that their countries' best advantages were best served by avoiding the issues of different nations at all costs. One conceivable inspiration for restricting worldwide inclusion is to abstain from being drawn into hazardous and generally unfortunate clashes. There may likewise be an apparent advantage from maintaining a strategic distance from global exchange understandings or other common help agreements.

The answer is forindependence.